Huawei HCIP-Access V2.5 H35-211_V2.5 Exam Dumps: Updated Questions & Answers (December 2025)

Type C GPON protection uses two different OLTs (dual-home). With uplink status linkage configured, a failure of the active OLT itself or its uplink interface triggers a protection switchover to the standby OLT to maintain service continuity for ONUs homed through the protected ODN.

XG-PON (10G GPON) adopts XGEM framing. Compared with GPON’s 12-bit GEM Port-ID, XGEM expands the Port-ID field to 16 bits, increasing the number of logical data flows that can be identified per ONU/OLT and improving service granularity. Hence the correct length is 16 bits.

A single-layer VLAN is limited by the IEEE 802.1Q VLAN ID space (1–4094), i.e., about 4K VLANs. In large PON deployments, when you must separate multiple services (e.g., HSI, VoIP, IPTV) and the user scale approaches or exceeds the 4K ceiling, a dual-layer VLAN (QinQ) design is required to extend the VLAN namespace and implement hierarchical isolation (access VLAN + service/aggregation VLAN).

Per RFC 3261 (SIP), “The CSeq header field of the response MUST equal the CSeq field of the request.” CSeq carries a sequence number and the method, thereby associating a response with the specific request it answers. While Call-ID ties together all messages within the same dialog, it does not identify the specific request/response pairing; CSeq does. Therefore, CSeq is the correct header for correlating a response to the exact request.

In U2000’s IPTV/IGMP service model, the IGMP template suite includes: Permission templates (program authorization), Multicast user templates (user IGMP attributes), Program templates (program/group definitions), and Preview parameter templates (preview/fast-zapping parameters). These cooperate to control user authorization, program mapping, and IGMP behavior.

In Huawei’s 10G GPON (XG-PON) system, the split ratio defines how many Optical Network Units (ONUs) can be connected to a single Optical Line Terminal (OLT) port through passive optical splitters.

According to ITU-T G.987.x standards and Huawei’s 10G GPON technical specifications, the maximum theoretical optical split ratio for 10G GPON is 1:128.

This means that a single OLT PON port can serve up to 128 ONUs through the passive optical distribution network (ODN).

While the physical capability supports 1:128, practical deployments often use lower ratios (e.g., 1:64) to maintain optical power budgets and ensure stable service quality, especially over longer fiber distances or when optical losses are high.

Huawei’s MA5800/EA5800 series OLTs, which support 10G GPON, comply fully with this standard, enabling 1:128 maximum splitting with appropriate ODN design.

Therefore, the correct answer is C. 1:128.

References (Aligned with HCIP-Access V2.5 and Huawei Technical Documentation):

HCIP-Access V2.5 Study Guide – “Huawei Campus Network Overview” Chapter, Section: GPON and 10G GPON Overview

Huawei 10G GPON (XG-PON) Technical White Paper

ITU-T G.987.1: 10-Gigabit-capable Passive Optical Networks (XG-PON) – General Characteristics

Huawei MA5800/EA5800 Product Description – Optical Port Split Ratio Specifications

Type B provides redundancy with two OLT PON ports on the same OLT and two feeder (backbone) fibers to the ODN. Therefore it protects the PON ports and the backbone/feeder path. It does not protect the OLT itself (still a single OLT) and does not protect the ONU branch fibers.

A is consistent with Huawei L2 multicast practice: global L2 multicast/IGMP snooping parameters can be set and then take effect for multicast VLANs involved in service provisioning.

B reflects the forwarding/CPU-punt behavior on access line cards: IGMP Reports/Leaves from users are recognized by board logic and processed by the control plane to update multicast state.

C matches default service control on BTV/IPTV access where a default program limit (commonly 8) per user applies unless adjusted by policy/profile.

D is incorrect: when IGMP match mode is disabled, multicast programs are not required to be pre-provisioned as channels; groups can be learned dynamically by IGMP. Preconfiguring channels is needed when match mode is enabled (channel matching enforced).

In 10G-EPON (IEEE 802.3av), the wavelength plan uses 1577 nm downstream and 1270 nm upstream. The 1270 nm upstream is used in both asymmetric and symmetric 10G-EPON profiles.

In Huawei access network devices (such as MA5800, EA5800, and SmartAX series), the DHCP Option 82 (Relay Agent Information Option) feature is used to identify the source location of DHCP requests coming from users connected to access ports.

This helps the DHCP server assign IP addresses based on access topology information, such as slot, port, and VLAN IDs.

When Option 82 is enabled globally and within the VLAN service profile, and the port/service-port is configured to allow user-side packets to carry Option 82, the device processes incoming DHCP requests as follows:

If a user-side DHCP packet does not contain Option 82:→ The device automatically adds local Option 82 information (e.g., circuit ID, remote ID) before forwarding it to the DHCP server.

If a user-side DHCP packet already contains Option 82:→ The device removes (strips) the existing Option 82 field to prevent spoofing or inconsistent location data.→ Then it adds its own local Option 82 information (accurate relay agent data based on the device’s configuration).→ The modified packet is then forwarded to the DHCP server.

This ensures that only trusted network-side Option 82 data is passed along, maintaining accurate user-location binding for IP address management and security.

Therefore, the correct behavior is:

The access device strips the Option 82 field from the user packet and adds its own local Option 82 information.

References (Aligned with HCIP-Access V2.5 and Huawei Technical Documents):

HCIP-Access V2.5 Study Guide – “Huawei Campus Network Overview” Chapter, Section: DHCP Relay and Option 82 Mechanism

Huawei MA5800/EA5800 Configuration Guide – IP Service → DHCP Relay and Option 82 Configuration

Huawei Enterprise Networking Product Documentation: “Understanding DHCP Option 82 Processing”

Huawei Access Network Feature Guide, Section: Processing Policies of DHCP Packets with Option 82